<p> Version date March 2015 MGordon/Baksh Lab</p><p>FFPE Histology Tissue Curl DNA/RNA Extraction- Manual Method</p><p>Modified from: 1) Loudig et al., Nucl. Acid Res. 2007, Molecular restoration of archived transcriptional profiles by complementary-template reverse-transcription (CT-RT) 2) Kotorashi et al., PLOS ONE 2012, Effective DNA/RNA co-extraction for analysis of microRNAs, mRNAs, and genomic DNA from formalin-fixed paraffin-embedded specimens 3) TRIZOL Reagent product information sheet protocol (Invitrogen)</p><p>REMINDERS: When working with DNA/RNA, always wear fresh clean gloves and a labcoat. Clean all equipment/ working spaces with RNAse Away and/or 100% ethanol prior to use in order to remove contaminating nucleic acids and RNAses which may degrade samples. </p><p>Equipment needed: Reagents: 10-15mL Wheaton homogenizers RNAse free EtOH rocker sterile PBS 59ºC heat block (days 1 and 2) RNAse OUT 50ºC heat block (day 3) 20mg/mL Proteinase K vortex TRIZOL Reagent (Invitrogen) 4ºC centrifuge (days 1 and 2) phenol/chloroform reagent (Invitrogen) 4ºC microcentrifuge (days 2 and 3) butanol 90ºC heat block (day 3) isopropanol 3M sodium acetate RNAse free water Buffer EB (Qiagen)</p><p>Recipes/Buffers:</p><p>1) Digestion Buffer: for 10mL 500µL 1M Tris-HCl pH 8 (final=50mM) 0.044g NaCl (final=75mM) 50µL 1M CaCl2 (final=5mM) 0.01g SDS (final= 0.1%) ddH2O to 10mL</p><p>2) Sodium citrate/ ethanol solution: for 10mL 0.258g sodium citrate 1mL 100% ethanol ddH2O to 10mL</p><p>3) SNET Buffer: for 10mL 0.1g SDS (final= 1%) 0.234g NaCl (final=400mM) 50µL 1M EDTA 200µL Tris-HCl pH 8 Version date March 2015 MGordon/Baksh Lab</p><p>DAY ONE: Tissue Processing</p><p>1) Deparaffinize tissue in 1mL of xylene @ room temp with rocking or shaking for 10min. Repeat twice. 2) Wash tissue in 1mL 100% EtOH @ room temp with rocking or shaking for 5min. Repeat twice. 3) Wash tissue in 1mL 95% EtOH @ room temp with rocking or shaking for 5min. Repeat twice. 4) Wash tissue in 1mL sterile 1X PBS for 1 min to rehydrate. Follow with incubation for 90min in 200µL sterile 1X PBS + 6.5µL RNAse OUT on ice. 5) Homogenize tissue in a clean Wheaton homogenizer using 2mL digestion buffer. Separate sample into five tubes containing 400µL each. 6) Add 2.8µL RNAse OUT to each tube. Add 60µL 20mg/mL Proteinase K to each tube. Incubate @ 59ºC for 1hr with vortexing every 5min. 7) Combine samples back into two 15mL tubes and spin down at 12000 rpm for 1 min. 8) Keep pellets on ice, add 1mL butanol to the supernatants. Vortex, centrifuge at 10000 rpm for 1 min. Pull off top layer and save as butanol phase (in case needed later). Repeat. 9) Resuspend tissue pellet in remaining lower phase. Should have around 150-200µL total volume. 10) Homogenize this solution in 1mL TRIZOL Reagent in a clean Wheaton homogenizer. Samples can be stored at this step @ room temp for several hours or at -80ºC for up to one month. 11) Incubate samples @ room temp for 5min. 12) Add 200µL phenol/chloroform to each tube. Shake or vortex vigorously for 15sec. Incubate 2-3 min @ room temp. 13) Incubate samples on ice for 10min to allow phase separation. Centrifuge at 12000xg for 15min @ 4ºC to further separate phases. 14) Remove the colorless upper aqueous phase and place into a new 15mL tube for RNA extraction. Save the interphase and lower red organic phenol/chloroform phase for DNA extraction. This can be stored at 4ºC overnight.</p><p>DAY TWO: RNA Isolation and Part one of DNA Isolation</p><p>RNA Isolation: 1) Add 500µL isopropanol to aqueous phase. Incubate @ room temp for 10min. 2) For further precipitation of RNA, add 1µL sodium acetate + 600µL ice-cold isopropanol. Incubate for 10min @ -20ºC. Centrifuge at 14000 rpm for 15min @ 4ºC. 3) Remove supernatant and leave RNA pellet on tube. Wash pellet with 1mL 75% EtOH. Vortex briefly, centrifuge @ 7500 xg for 5min @ 4ºC. Save supernatant as RNA wash (in case needed later) 4) Air dry pellet for 5-10min @ room temp. Do not allow pellet to dry completely. 5) Resuspend pellet in 50µL RNAse-free water by pipetting up and down. Incubate at 59ºC for 10-15min. Store at -80ºC. Version date March 2015 MGordon/Baksh Lab</p><p>DNA Isolation: 1) Remove any remaining aqueous phase in order to ensure higher quality DNA isolation. 2) Add 1.2mL 100% EtOH + 20µL 3M sodium acetate to the interphase/phenol/chloroform phases. Cap and invert several times to mix. 3) Incubate @ room temp for 3min, followed by centrifugation @ 16000 rpm for 20min @ 4ºC. Remove phenol-ethanol supernatant and store @ -80ºC for protein isolation or keep in case needed later. 4) Wash DNA pellet with 1mL sodium citrate/ethanol solution. Incubate for 30min @ room temp with occasional mixing by inversion. (Can stay in solution for up to 2 hours) 5) Centrifuge at 5000 xg for 5min @ 4ºC. Pull off supernatant and keep in case needed later. 6) Add 2mL 100% EtOH to wash pellet. Incubate 10min @ room temp with occasional inversion. Centrifuge at 5000 xg for 5min @ 4ºC. Pull off supernatant and keep in case needed later. 7) Air dry pellet at 50ºC for 5min. Do not allow pellet to dry out. 8) Add 400µL SNET buffer + 70µL 20mg/mL Proteinase K. Incubate at 56ºC overnight, with occasional vortexing before you leave. ***Overnight incubation is essential in order to remove protein that may have become cross-linked to DNA during formalin fixation. DNA cross-linked to protein will otherwise be lost in further washes. </p><p>DAY THREE: DNA Isolation</p><p>1) Incubate DNA sample @ 90ºC for 1hr in order to deactivate Proteinase K. 2) Precipitate DNA by adding 200µL ice-cold 75% EtOH. Incubate 10min @ room temp. Centrifuge @ 5000 xg for 10min @ 4ºC. Remove and discard supernatant. Repeat EtOH washes twice more. 3) Air dry pellet @ 50ºC for 5-10min. Add 100µL Buffer EB to resuspend pellet. Incubate @ 50ºC for 5-10min to further dissolve pellet. Pipette up and down to mix. Store at -80ºC.</p>